Abstract
Modified and advanced approach has been developed for the synthesis of meso-tetra(methyl) meso-tetra(4-hydroxy phenyl) calix[4]pyrrole, meso-tetra(methyl) meso-tetra(3, 5-dihydroxy phenyl) calix[4]pyrrole and their azo dyes using microwave irradiation. Results obtained from conventional method and microwave assisted synthesis have been compared in terms of ease, yield and time. Detailed reaction mechanism has also been discussed. The structures of all compounds were characterized based on FT-IR, 1H NMR and elemental analysis. A preliminary study on efficiency of these novel azocalix[4]pyrrole receptors towards copper (II) have been carried out by UV/Vis spectrophotometry at 25 °C which shows a distinct color change from yellow to red upon complexation.
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